Because cryptonote coins are different than bitcoin clones. They tried adding cryptonote a long time ago but were unable to incorporate it into their trading platform. This topic comes up frequently in cryptonote coin threads. Exchanges supporting cryptonote are Poloniex, Bittrex, Cryptopia, and BTER. Boolberry is listed on all of those. If by some very small chance c-cex makes another attempt to incorporate cryptonote coins into their platform and lists Boolberry it isn't going to have any effect anyway. Just what do you think being listed on c-cex would do for Boolberry? It's already on Poloniex which is by far a much larger exchange by volume.